摘要： 激光雷达(LIDAR)数据是一种新型数据源，它产生的是高密度点云数据。为了更加方便地应用这些数据，首先要生成数字表面模型(DSM)。采用传统的方法生成城市DSM，对城市区域复杂性的考虑不足，也没有对数据存在的缺值情况进行相应处理，故无法生成高质量的城市DSM。该文阐述了一种新颖的生成高质量城市DSM的方法，兼顾城市的复杂性和LIDAR传感器本身的特点。试验证明，该方法生成的DSM与传统方法相比，具备更好的效果。
关键词:
激光雷达,
数字表面模型,
三角网,
插值算法,
EM算法
Abstract: LIDAR data are new data source, and they generate a high spatial resolution “point cloud”. To use it, the first step generally is to translate it to Digital Surface Model (DSM). The traditional methods are limited in terms of generation of DSM in urban areas because the urban environment is extremely complex with many man-made objects of different features and heights, and those methods do not consider conditions when data are missing. DSM generated using these traditional interpolation methods cannot achieve the purpose needed for urban applications, such as precision. This paper presents a new method to generate DSM considering characteristics of cities and traits of LIDAR sensors. The DSM generated using this method has better quality than that using transitional ones.
Key words:
Light Detection And Ranging (LIDAR),
Digital Surface Model (DSM),
TIN,
interpolation algorithm,
EM algorithm
中图分类号:
汪承义;赵忠明. 基于LIDAR数据的城市数字表面模型生成技术[J]. 计算机工程, 2008, 34(1): 59-60,6.
WANG Cheng-yi; ZHAO Zhong-ming. Digital Surface Model Generation From LIDAR Data in Urban Areas[J]. Computer Engineering, 2008, 34(1): 59-60,6.